External magnetic type coaxial opposed double-moving-coil loudspeaker

Abstract

The utility model discloses an external magnetic coaxial opposed double moving coil loudspeaker, which comprises an annular cavity, a vibration system and a magnet system, the vibration system and the magnet system form a moving coil assembly, the vibration system is arranged in the middle of the annular cavity, the magnet system is arranged close to two ends of the annular cavity, and the moving coil assembly is arranged close to the annular cavity. According to the external magnetic type coaxial opposed double-moving-coil loudspeaker, the moving coil assemblies are symmetrically arranged, the external magnets on the two sides of the moving coil assemblies respectively generate magnetic induction lines, the magnetic induction lines of the two moving coil assemblies repel each other, and then the magnetic induction lines are compressed to be more dense and concentrated, so that the magnetic field intensity generated by the assemblies in the magnet system is increased, and the Ampere force is in direct proportion to the magnetic field intensity; therefore, the Ampere force of the driving diaphragm is improved, displacement caused by mutual vibration is suppressed by mutual counterbalance, air damping in the earphone space is improved, even harmonic distortion is reduced, and the sound effect is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of double moving coil speakers, in particular to an external magnetic type coaxial opposed double moving coil speaker Background Art

[0002] The moving coil speaker is a widely used type of speaker. It uses the magnetic effect generated by the flow of current in a wire to drive the diaphragm to vibrate, thereby generating sound

[0003] For multi-unit headphones, the moving coil unit is often used as the low-frequency unit. In order to further improve the low-frequency performance of the headphones, multiple moving coil units can be used. However, it is very easy for different moving coils to affect each other and it will occupy a large amount of space. Some speakers use additional moving coil fixing components to combine two or more moving coils into a module, which is responsible for the low-frequency part of the headphones as a whole. Although this method eliminates the influence between the moving coils as much as possible, additional lead wires are required to connect between each moving coil, and the fixing components themselves occupy most of the space, greatly increasing the volume of the module

[0004] Therefore, the utility model provides an external magnetic type coaxial opposed double moving coil speaker to solve the above problems Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides an external magnetic type coaxial opposed double moving coil speaker to solve the above problems

[0006] To achieve the above objectives, the utility model is realized through the following technical solutions: an external magnetic type coaxial opposed double moving coil speaker, including an annular cavity, further including a vibration system and a magnet system. The vibration system and the magnet system form a moving coil assembly. The vibration system is arranged in the middle of the annular cavity, and the magnet system is arranged near both ends of the annular cavity. The diameters of both ends of the annular cavity are larger than the diameter of the middle part, so that an annular clamping position is formed in the middle part inside the annular cavity. A wire groove is arranged inside the annular cavity, and a sound outlet nozzle is communicated with the side end of the annular cavity

[0007] Preferably, the vibration system includes a diaphragm. The diaphragm is arranged inside the annular cavity. A copper ring is bonded to the side of the diaphragm away from the annular cavity, and a voice coil is arranged on the side of the diaphragm away from the annular cavity

[0008] Preferably, two lead wires are led out from the voice coil

[0009] Preferably, the magnet system includes a washer, an external magnet and a T-iron. The washer, the external magnet and the T-iron are sequentially and fixedly connected inside the annular cavity. A magnetic gap is formed after the cylinder on the T-iron cooperates with the hole of the washer

[0010] Preferably, the voice coil is movably arranged in the magnetic gap.

[0011] An alternative technical solution is that a compliance adjusting piece is arranged at one end of the pole piece away from the diaphragm. The compliance adjusting piece is fixedly connected inside the annular cavity, and a damping net is arranged on the compliance adjusting piece.

[0012] Another alternative technical solution is that a damping net is fixedly installed on the back of the pole piece. In this case, there is no need to set a compliance adjusting piece.

[0013] Furthermore, a PCB is arranged on the other side of the damping net. The PCB is fixedly connected inside the annular cavity, and only a single PCB is provided.

[0014] There is also an alternative technical solution that an annular inner magnet with a hole in the center is arranged in the cavity of the pole piece, and a PCB is arranged on the side of the pole piece away from the diaphragm. At this time, the voice coil is driven by the combined action of the inner magnet and the outer magnet.

[0015] Preferably, the leads drawn from the voice coil are all connected to the PCB through the wire grooves on the inner side of the annular cavity.

[0016] Advantageous Effects

[0017] The present utility model provides an external magnetic type coaxial opposed double moving coil loudspeaker. Compared with the prior art, it has the following advantageous effects:

[0018] (1) For an external magnetic type coaxial opposed double moving coil loudspeaker, through the symmetrical arrangement of the moving coil assemblies, the outer magnets on both sides respectively generate magnetic induction lines, and the magnetic induction lines of the two repel each other. Then, the magnetic induction lines are compressed and become more concentrated, so that the magnetic field intensity generated by the components in the magnet system increases. Since the Ampere force is proportional to the magnetic field intensity, the Ampere force for driving the diaphragm is increased. At the same time, they also balance and restrain the displacement caused by each other's vibration, improve the air damping in the headphone space, and thus reduce the even harmonic distortion, thereby enhancing the sound effect.

[0019] (2) For an external magnetic type coaxial opposed double moving coil loudspeaker, by providing a single PCB, the leads of the two voice coils are led to one side of the PCB through the internal wire grooves of the annular cavity, reducing the number of PCBs, thereby avoiding connecting lines from outside the annular cavity, and thus reducing the overall volume and assembly difficulty of the loudspeaker. Description of the Drawings

[0020] Figure 1 is the internal structure diagram of Embodiment 1 of the present utility model;

[0021] Figure 2 is the side view of the structure of Embodiment 1 of the present utility model;

[0022] Figure 3This is a cross-sectional view of the annular cavity in the embodiment of the present utility model.

[0023] In the figure: 1, annular cavity; 2, sound outlet nozzle;

[0024] Vibration system: 31, diaphragm; 32, copper ring; 33, voice coil;

[0025] Magnet system: 41, washer; 42, outer magnet; 43, T-iron;

[0026] 5, compliance adjusting piece; 6, damping net; 7, PCB. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] Embodiment 1:

[0029] Please refer to Figure 1-2 , an external magnetic coaxial opposed double voice coil speaker, including an annular cavity 1, further including a vibration system and a magnet system. The vibration system and the magnet system form a voice coil assembly. The vibration system is arranged in the middle of the annular cavity 1, and the magnet system is arranged near both ends of the annular cavity 1. As Figure 3 shown, the diameters of both ends of the annular cavity 1 are larger than the diameter of the middle part, so that an annular clamping position is formed in the middle part inside the annular cavity 1. A wire groove is arranged inside the annular cavity 1, and a sound outlet nozzle 2 is communicated with the side end of the annular cavity 1.

[0030] The vibration system includes a diaphragm 31. The diaphragm 31 is arranged inside the annular cavity 1. A copper ring 32 is bonded to the side of the diaphragm 31 away from the annular cavity 1, and a voice coil 33 is arranged on the side of the diaphragm 31 away from the annular cavity 1.

[0031] Two leads are led out from the voice coil 33.

[0032] The magnet system includes a washer 41, an outer magnet 42 and a T-iron 43. The washer 41, the outer magnet 42 and the T-iron 43 are sequentially fixedly connected inside the annular cavity 1. A magnetic gap is formed after the cylinder on the T-iron 43 is matched with the hole of the washer 41.

[0033] The voice coil 33 is movably arranged in the magnetic gap. A notch can be arranged on the side end of the T-iron 43, or not; the washer 41 can be provided with a cut edge as Figure 1 shown, or not provided with a cut edge and is integrally circular.

[0034] One end of the T-iron 43 away from the diaphragm 31 is provided with a compliance adjusting piece 5. The side end of the compliance adjusting piece 5 can be provided with a notch corresponding to the T-iron 43, or can be not provided with a notch. The compliance adjusting piece 5 is fixedly connected inside the annular cavity 1. One side of the compliance adjusting piece 5 away from the diaphragm 31 is provided with a PCB 7. The PCB 7 is fixedly connected inside the annular cavity 1. A damping net 6 is arranged on the compliance adjusting piece 5, and only a single PCB 7 is provided.

[0035] The damping net 6 is attached to the compliance adjusting piece 5. In the attached drawings of the specification of this embodiment, taking the T-iron 43 and the compliance adjusting piece 5 with notches as an example for illustration, notches can also be not provided in the actually produced products.

[0036] The leads led out from the voice coil 33 are all connected to the PCB 7 through the wire grooves inside the annular cavity 1.

[0037] In this embodiment, the washer 41 is the gasket, which is used as a magnetic conductive sheet here. The PCB refers to the circuit board, and the circuit board on the moving coil loudspeaker in the prior art can be adopted. They are all products in the prior art and can be obtained through commercial means. Those skilled in the art can select appropriate models according to the prior art.

[0038] The compliance adjusting piece 5 is a sheet-like structure with a central hole in the central part. A damping net 6 is arranged on the central hole of the compliance adjusting piece 5 to adjust the compliance of the T-iron 43. By changing the size of the central hole and the density of the damping net 6 on the compliance adjusting piece 5, the function of changing the air flow velocity can be achieved, and the compliance adjustment of the T-iron 43 can be realized.

[0039] Working principle: The annular cavity 1 functions to fix the diaphragm 31, the copper ring 32, the voice coil 33, the washer 41, the outer magnet 42, the T-iron 43, the compliance adjusting piece 5, and the PCB 7. The loudspeaker is provided with a single PCB 7, so that the leads of the two voice coils 33 are led to one side PCB 7 through the internal wire grooves of the annular cavity 1, reducing the number of PCBs 7, thereby avoiding connecting lines from outside the annular cavity 1, and thus reducing the volume and assembly difficulty of the overall loudspeaker.

[0040] Based on the working principle of the moving coil, when an electric current flows through the voice coil 33, a magnetic field is generated. The magnetic field interacts with the magnetic field of the outer magnet 42, thereby driving the diaphragm 31 to vibrate. The washer 41 is used to improve the efficiency and power factor of the voice coil 33.

[0041] By symmetrically arranging the moving coil components, magnetic induction lines are respectively generated by the outer magnets 42 on both sides. The magnetic induction lines of the two repel each other, and then the magnetic induction lines are compressed and become denser and more concentrated, increasing the magnetic field intensity generated by the components in the magnet system. Since the Ampere force is proportional to the magnetic field intensity, the Ampere force driving the diaphragm 31 is increased. At the same time, they also balance and restrain the displacement caused by each other's vibration, improving the air damping in the headphone space, thereby reducing even-order harmonic distortion and greatly improving the low-frequency performance of the moving coil speaker, thus enhancing the sound effect.

[0042] Embodiment Two:

[0043] The parts that are the same as those in Embodiment One in this embodiment will not be described in detail. The parts that are different from Embodiment One in this embodiment are as follows: In this embodiment, the compliance adjusting piece 5 in Embodiment One is cancelled, and the damping net 6 is directly fixed on the back of the T-iron 43, and the PCB 7 is arranged on the other side of the damping net 6.

[0044] The principle of this embodiment is similar to that of Embodiment One. By changing the density of the damping net 6, the function of changing the air flow velocity can be achieved, and the compliance adjustment of the T-iron 43 can be realized.

[0045] Embodiment Three:

[0046] The parts that are the same as those in Embodiment One in this embodiment will not be described in detail. The parts that are different from Embodiment One in this embodiment are as follows: In this embodiment, a ring-shaped inner magnet with a hole in the center is arranged in the cavity of the T-iron 43, and the voice coil is driven by the combined action of the inner magnet and the outer magnet.

[0047] At the same time, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0048] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An external magnetic type coaxial opposed double moving coil loudspeaker, comprising an annular cavity (1), characterized in that, It further includes a vibration system and a magnet system. The vibration system and the magnet system form a moving coil assembly. The vibration system is arranged in the middle of the annular cavity (1), and the magnet system is arranged near both ends of the annular cavity (1). The diameters of both ends of the annular cavity (1) are larger than the diameter of the middle part, so that an annular clamping position is formed in the middle part inside the annular cavity (1). A wire groove is arranged inside the annular cavity (1), and a sound outlet nozzle (2) is communicated with the side end of the annular cavity (1).

2. The external magnetic type coaxial opposed dual moving coil loudspeaker according to claim 1, wherein: The vibration system includes a diaphragm (31). The diaphragm (31) is arranged inside the annular cavity (1). A copper ring (32) is bonded to the side of the diaphragm (31) away from the annular cavity (1), and a voice coil (33) is arranged on the side of the diaphragm (31) away from the annular cavity (1).

3. The external magnetic type coaxial opposed dual moving coil loudspeaker according to claim 2, characterized in that: Two leads are led out from the voice coil (33).

4. The external magnetic type coaxial opposed dual moving coil loudspeaker according to claim 3, characterized in that: The magnet system includes a washer (41), an outer magnet (42) and a T-iron (43). The washer (41), the outer magnet (42) and the T-iron (43) are sequentially and fixedly connected inside the annular cavity (1). A magnetic gap is formed after the cylinder on the T-iron (43) is matched with the hole of the washer (41).

5. The external magnetic type coaxial opposed dual moving coil loudspeaker according to claim 4, wherein: The voice coil (33) is movably arranged in the magnetic gap.

6. The external magnetic type coaxial opposed dual moving coil loudspeaker according to claim 5, characterized in that: A compliance adjustment piece (5) is arranged at the end of the T-iron (43) away from the diaphragm (31). The compliance adjustment piece (5) is fixedly connected inside the annular cavity (1), and a damping net (6) is arranged on the compliance adjustment piece (5).

7. The external magnetic type coaxial opposed double moving coil loudspeaker according to claim 5, wherein: A damping net (6) is fixedly installed on the back of the T-iron (43).

8. The external magnetic type coaxial opposed double moving coil loudspeaker according to claim 6 or 7, characterized in that: A PCB (7) is arranged on the other side of the damping net (6). The PCB (7) is fixedly connected inside the annular cavity (1), and only a single PCB (7) is provided.

9. An external magnetic type coaxial opposed dual moving coil loudspeaker according to claim 6 or 7, characterized in that: An annular inner magnet with a hole in the center is arranged in the cavity of the T-iron (43), and a PCB (7) is arranged on the side of the T-iron (43) away from the diaphragm (31).

10. The external magnetic type coaxial opposed dual moving coil loudspeaker according to claim 8, wherein: The leads led out from the voice coil (33) are all connected to the PCB (7) through the wire groove inside the inner side of the annular cavity (1).

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